Black smoke

Black smoke

A police car burns after violent anti-G20 protesters smashed their way through downtown streets June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit.Photo by Konstantin Zavrazhin/Getty Images

A police car burns after violent anti-G20 protesters smashed their way through downtown streets June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit.Photo by Konstantin Zavrazhin/Getty Images

A police car burns after violent anti-G20 protesters smashed their way through downtown streets June 26, 2010 in Toronto, Canada. Violent protesters burned police cars, smashed shop fronts and confronted the force of approximately 20,000 police who were charged with keeping order during the first day of the G20 Summit.Photo by Konstantin Zavrazhin/Getty Images